note related to this contribution
| - This work was initiated while these authors were members of the Drug Design and Synthesis Section, Laboratory of Medicinal Chemistry, National Institute of Diabetes, Digestive and Kidney Diseases, NIH.
- Drug Design and Synthesis Section, National Institute on Drug Abuse and the National Institute on Alcohol Abuse and Alcoholism, Department of Health and Human Services.
- Current address: Faculty of Chemistry, Adam Mickiewicz University, 60-780 Poznan, Poland.
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